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ixgbe: Fix - Do not allow Rx FC on 82598 at 1G due to errata

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The 82598 has an erratum that receipt of pause frames at 1G
could lead to a Tx Hang.  To avoid this this patch disables
Rx FC while at 1G speed for all 82598 parts.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Don Skidmore 2010-02-11 04:13:49 +00:00 committed by David S. Miller
parent 3d0beb921f
commit a626e8478b
1 changed files with 22 additions and 0 deletions
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22
drivers/net/ixgbe/ixgbe_82598.c
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@ -357,12 +357,34 @@ static s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw, s32 packetbuf_num)
u32 fctrl_reg;
u32 rmcs_reg;
u32 reg;
u32 link_speed = 0;
bool link_up;
#ifdef CONFIG_DCB
if (hw->fc.requested_mode == ixgbe_fc_pfc)
goto out;
#endif /* CONFIG_DCB */
/*
* On 82598 having Rx FC on causes resets while doing 1G
* so if it's on turn it off once we know link_speed. For
* more details see 82598 Specification update.
*/
hw->mac.ops.check_link(hw, &link_speed, &link_up, false);
if (link_up && link_speed == IXGBE_LINK_SPEED_1GB_FULL) {
switch (hw->fc.requested_mode) {
case ixgbe_fc_full:
hw->fc.requested_mode = ixgbe_fc_tx_pause;
break;
case ixgbe_fc_rx_pause:
hw->fc.requested_mode = ixgbe_fc_none;
break;
default:
/* no change */
break;
}
}
/* Negotiate the fc mode to use */
ret_val = ixgbe_fc_autoneg(hw);
if (ret_val)